Maintenance requirement and deposition efficiency of lysine in pigs

Marcos Speroni Ceron,Marcos Martinez Do Vale,Vladimir De Oliveira,Paulo Alberto Lovatto

doi:10.1590/s0100-204x2013000900011

Marcos Speroni Ceron, Marcos Martinez Do Vale + Show 2 more

Open Access

https://doi.org/10.1590/s0100-204x2013000900011

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Abstract

The objective of this work was to determine the maintenance requirement and the deposition efficiency of lysine in growing pigs. It was used the incomplete changeover experimental design, with replicates over time. Twelve castrated pigs with average body weight (BW) of 52±2 kg were kept in metabolism crates with a controlled temperature of 22ºC. The diets were formulated to supply 30, 50, 60, and 70% of the expected requirements of standardized lysine, and provided at 2.6 times the energy requirements for maintenance. The trial lasted 24 days and was divided into two periods of 12 days: seven days for animal adaptation to the diet and five days for sample collection. The increasing content of lysine in the diet did not affect dry matter intake of the pigs. The amount of nitrogen excreted was 47% of the nitrogen intake, of which 35% was excreted through feces and 65% through urine. The estimated endogenous losses of lysine were 36.4 mg kg-1 BW0.75. The maintenance requirement of lysine for pigs weighing around 50 kg is 40.4 mg kg-1 BW0.75, and the deposition efficiency of lysine is 90%.

Highlights

IntroductionThe factorial method used to determine amino acid requirements divides the total demands into two factors: maintenance and protein growth (Sakomura & Rostagno, 2007; Pomar et al, 2009)
Understanding the nutritional requirements of pigs is essential to develop dietary strategies to maximize economic profit and minimize nutrient excretion.The factorial method used to determine amino acid requirements divides the total demands into two factors: maintenance and protein growth (Sakomura & Rostagno, 2007; Pomar et al, 2009)
Increasing contents of SID lysine had a linear effect on nitrogen intake

Summary

Introduction

The factorial method used to determine amino acid requirements divides the total demands into two factors: maintenance and protein growth (Sakomura & Rostagno, 2007; Pomar et al, 2009). Amino acid maintenance requirements are based on the assumption that there is a constant metabolic activity. The main biological events that determine the maintenance requirements are: endogenous amino acid losses, inefficiency of the protein synthesis process, hair loss and desquamation (Moughan, 2003). Protein growth or protein deposition capacity is influenced by factors such as genetics, gender, age, and sanitary status of the animal. Knowledge about the protein deposition curve is vital when the intention is to use the factorial method to determine the maintenance requirements. Information on how the absorbed amino acids are efficiently used to form body proteins are necessary.

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